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Throttles not closing properly in the B738

05May2019, 14:49

Hi﻿﻿ everyone I have noticed this for years and just put up with it but thought someone might know what the problem is. When I land and pull the throttles to idle there remains some residual thrust in the engines until I push the throttles forward a bit again and then back to idle.

It only happens with th﻿e PMDG B737. I have the PMDG B777 plus TFDi B717, Flight 1 Mustang﻿, Vertex DA62 and have no issues with any other aircraft.

Hi﻿﻿ everyone I have noticed this for years and just put up with it but thought someone might know what the problem is. When I land and pull the throttles to idle there remains some residual thrust in the engines until I push the throttles forward a bit again and then back to idle.

It only happens with th﻿e PMDG B737. I have the PMDG B777 plus TFDi B717, Flight 1 Mustang﻿, Vertex DA62 and have no issues with any other aircraft.

Observed the same trouble but i put this in my "forgotten file map somewhere on my HD". And if your throttle is not closed it is not possible to active the reversers. I'm use two spare buttons on my yoke to close the throttle and to activate the reverser (F1-F2). The PMDG 737 is the most problematic about this. In my case it has nothing to do with FSUIPC or bad potentiometers

Comment

What is actually happening during descent is that as you descend from FL400 through FL280 the flight idle N1 will decrease quite a bit. At some point the NGX gets stuck a few percent above where it should be an a little tap on the throttle wakes it up. It is most pronounced in the B736 with those lower rated engines. In the B738 I have found it is only noticeable where a good tail wind is pushing the IAS up and it helps to bump the throttle to reset the idle. In the B736 is it noticeable on every decent and I've told PMDG about this a year or ago. Problem will be resolved in the NG3.

I've never found this to be a problem (the landing issue), in fact I've never noticed it and it doesn't impact the function of my reverse thrust. I am using a Thrustmaster HOTAS directly calibrated and assigned in P3D, no FSUIPC involved. I normally do not glance down at my EICAS until reverse engages to verify it's working so next time I'll try to remember to look at N1 before going into reverse. Interesting.

Comment

ddowns: try this. when you start decent from above FL300. the throttles go to idle.. however, hit F1 while you actually watch the throttles in the VC. youll see the throttles close all the way to the stops, then automatically rebound slightly. this continues until youre below ~FL300 at which point they will stay completely closed. i see the same behavior in all of the ngx's 600-900 i swear it looks like its intentional

my A/T manual override (in simulaton options) is set to NEVER, so my physical throttles are dead when the a/t is engaged.